kùn
to trap, surround
Original meaning:
doorway, threshold
Depicts a wooden (木) door frame (囗). Based on the original meaning "doorway, threshold". The meaning later expanded to "obstruct" and "trap".
Evolution

Oracle script
(~1250-1000 BC)
Seal script
Shuowen (~100 AD)
Clerical script
Eastern Han dynasty (25-220 AD)Regular script
ModernDefinitions
Sources